Novel introduction to extreme combat sport (4)
I believe the answer is:
emma
'novel' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for emma that I've seen before include "Retired chief in Ian Fleming" , "Novel by June Austen" , "J Austen novel" , "Jane Austen heroine" , "Jane Austen's fourth novel (1815)" .)